Reproduction Flashcards
1
Q
What is sexual reproduction?
A
Where genetic information from two organisms (father and mother) is combined to produce offspring which are genetically different to either parent
2
Q
What are gametes?
A
Egg and sperm cells
3
Q
In humans, how many chromosomes does each gamete contain?
A
23 chromosomes - aka half the chromosome number of a normal cell
→ Instead of having two copies of each chromosomes, a gamete just has one
4
Q
What does secual reproduction involve?
A
The fusion of male and female gametes
→ Because there are two parents, the offspring contain a mixture of their parents genes
5
Q
What is Asexual reproduction
A
When a cell divides into two and the new cell contains exactly rhe same genetic information as the parent cell
6
Q
Explain how Asexual reproduction happens
A
- X-shaped chromosomes have two identical halves
- So each chromosome splits down the middle to form idential sets of ‘half chromosomes’ and a membrane forms around each set
- And the DNA replicates itself to form two identical cells with complete sets of X-shaped chromosomes
